import Vue from 'vue'
import Router from 'vue-router'
import Login from './components/login.vue'
import Home from './components/home.vue'
import Welcome from './components/welcome.vue'
import Users from './components/user/users.vue'

Vue.use(Router)

const router = new Router({
  routes: [
    {
      path: '/', redirect: '/login'
    },
    {
      path: '/login', component: Login
    },
    {
      path: '/home', component: Home, redirect:'/welcome',
      children: [
        {path:'/welcome', component: Welcome},
        {path:'/users', component: Users}
      ]      
    }
  ]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to:将要访问的路径 from: 表示从哪个路径跳转而来 next: 一个函数，表示放行
  //  next()放行，next('/login'):强制跳转
  // 用户直接访问登录页面
  if(to.path === '/login') return next();
  // 获取sessionStorage 的token值
  const tokenStr = window.sessionStorage.getItem('token');
  if(!tokenStr) return next('/login');
  next();
})
export default router;
